Electromagnetic vibrating



H. E. WURZBACH 1=:r AL Re- 19,817 ELECTROMAGNETIC VIBR ATING APPARATUSJan. 7, 1936.

Original File d July 1,1932 2 Sheets-Sheet 1 Jan. 7, 1936.

H. E. WURZBACH ET AL ELECTROMAGNETIC VIBRATiNG APPARATUS Original FiledJuly I, 1952 2 Sheets-Sheet 2 v A. C. or

0. CZSII /y 5O Y a INVENTORS. Ivy/z ET Ww'zbadb By Clfo'e Ejfanold,

L W W R EYS.

' the respective electromagnetic devices of each electromagnetic means.

Reiuued Jan. 7, 1936 ELECTROMAGNETIC VIBBATING APPARATUS Hugh E.Wurzbach and Clyde 1!. Konold, Magna, Utah Original No. 1,945,015, datedJanuary 30, 1934, Serial No. 620,340, July 1, 1932. Reissue No. 19,816,dated January 7, 1936, Serial No. 29,366, July 1, 1935. Divided and thisapplication for reissue October 7, 1935, Serial No. 43,992

-2 Claims. (Cl. 172126) This invention relates to an improvement in havebeen made in which electromagnets are used electrically operatedvibrating apparatus adapted to attract armatures attached to theoperated for use in operating various vibrating devices vibrating memberwhich is supported on resilsuch as screens, grizzlies, feeders,conveyors, froth lent means but such devices have heretofore debreakers,etc. pended on the use of strong resilient devices such The main objectof the invention is to proas steel bars or coil springs which give akick vide means for operating a vibrating device by or vibration to the.operated member when repositive electromagnetic action in bothdirecleased by the electromagnets so that, for extions of the vibratingmovement thereby obtainample, the electromagnets provide the power foring a more efiective and positive action than is the stroke in onedirection and the springs propossible where the vibrating movement inone divide the power for the stroke in the opposite direction isefiected by electromagnetic means and rection. These resilient devicesor springs must the movement in the opposite direction is effected bestrong and still so as to cause the operated by resilient meansoperating in opposition to the member to have a quick snap when releasedfrom the electromagnets and therefore the power required to deflect themis higher than is necessary if both directions of movement are effectedby electromagnetic power. With our apparatus the A further object of theinvention is to obtain economies in construction and operation bydispensing with resilient return means operating in Opposition o e elecroma ne ic Operating resilient support for the operated means is notmeans depended upon to effect the return movement of A further Objectofflie invention is t P ov de said means and a relatively lightresilient supfor electromagnetic operation of vibrating deportin meansmay therefore be used. vi es by ny el ri l pow r system without thYielding or resilient stop members, such as id n req n y n r motor s nrubber bumpers, are also preferably provided for tor s o rotary ers forchan ing the limiting the movement of the operated member v q cy orshape of the current wave in each direction by-the respective electrom111 the pp y circuit. netic devices.

The apparatus comprises electromagnetic op- Th accompanying drawingsillustrate the inerating means including one or more electromagr ventionand-referring thereto: netic units each of which comprises two elec-Fig. 1 is a side elevation of the electromagnetic 1 tromagnetic devicesoperating in opposite direcvibrating means;

tions upon the operated member or means, and Fig, 2 is a section on line2! in Fig. 1;

circuit connections for alternately energizing said Fig. 3 is a diagramshowing the electrical operelectromagnetic devices. According to apreating connections for the electromagnetic viferred embodiment of theinvention, means are brating means; provided for energizing said devicesfrom an al- Fig. 4 is a graph of an alternating current ternatingcurrent circuit, in such manner that wave illustrating the'selection ofrectified half waves for distribution to the respective membersoperating unit are energized alternately by alter or the electromagneticvibrating unit; nate half waves of the alternating current. For thispurpose suitable rectifying means are included in the connections fromthe alternating current circuit to the respective electromagneticdevices in such manner that half waves in one direction are conducted toone electromagnetic device and the half waves in the opposite direc tionare conducted to the other electromagnetic device, so that the said twoelectromagnetic devices operate alternately on suitable armature meansconnected to the operated members to effect positive vibration thereof.The operated member is preferably resiliently supported to enable it totake up the vibrations imparted thereto by the said electromagneticmeans.

Electromagneticaily operated vibratory devices ical rectifying apparatuswhich may be used for magnetic units;

Fig. 6 is a diagrammatic showing of an alternative mechanical rectifljerarrangement which may be used for alternate energization of therespective electromagnetic units from an A. C. or D. C. energy supply;

- generator arrangement whereby any desired frequency of alternateenergization of the electromagnetic units may be obtained.

Our invention may be applied to operation of any vibrating means such asa screen, conveyor,

- feed box et cetera; The operated vibrating Fig. is a diagrammaticshowing of a mechanalternate energization of the respective electro-Fig. 7 is a diagrammatic showing of a motor-- 'brating means I by across bar' 5.

- indicated at I in Figs. 1 and 2 is shown as resiliently mounted on asupporting means or frame, for example, by means of two parallelelongated rigid vibratory members 2, such as bars of steel or othersuitable material disposed at the respective sides of the supportingframe, resiliently mounted on supports 1 and I in any suitable manner,for resilient vibratory movement in a direction transverse to the lengththereof.- The bars 2 are shown connected to the operated vi- It will beunderstood that the member I' may be mounted to vibrate in vertical,inclined or horizontal directions, according to the specific applicationof the same.

The resilient supporting means may comprise springs 28 and 39 mounted onthe supports I and 9 at opposite sides of the central portion of saidbars 2 and resiliently engaging said bars. Rubber stops or bumpers 40and H may be provided if,

desired, positioned on the frame members I and 8 to engage the vibratorymembers 2 at opposite armature means of the electromagnetic operatingmeans hereinafter described, so as to limit.

the vibratory movement of said members. and the member Icarried'thereby. If desired, the supporting springs 38 and 39 may beomitted and the rubber bumpers 40 and H may be adjusted to normallyengage the vibratory members 2 and to resiliently support the same whileat the same time limiting their vibratory movement by reason of thelimited compressibility of the rubber members. Any suitable means may beprovided for securing the vibratory members 2 against lateral orlongitudinal displacement in a direction perpendicular to the directionof vibratory movement thereof, 'while permitting such vibratorymovement. For this purpose, positioning members such as rods 41 may beprovided extending slidabiy through the members 2 and secured to thesupporting frame members I and 9. Said positioning members may extendcentrally within the bumper members 49 and H, as shown, or within thesprings 28 and 39, or at any other suitable positions.

The electromagnetic operating means for the member I are shown mountedon the supports 1 and 8 and may comprise an electromagnetic unit at eachside of the device, each unit comprising an electromagnet Ill mounted onthe support I, an electromagnet II mounted on support 8, and separatearmature means I2 and I! for the respective electromagnets, secured tothe intermediate portion of the vibratory bars 2 at the correspondingside of the member I or other- -wise connected to said member I toimpart vi bration thereto, the armature m'eans I2 and II of each unitbeing mounted at the opposite sides of the correspondingbar in the planeof vibration thereof. The core members and armatures for the respectiveelectromagnets are preferably made of laminated soft iron to enable themto operate on rapidlyintermittent current without objectionable lag orproduction of eddy currents. The armatures, being of soft iron, exceptfor the momentary polarization due to the influence of the associatedelectromagnets, are not magnetically polarized, and are not providedwith electric windings or coils for self-energization orselfpolarization. The term armature" as used herein and in the appendedclaims, will be understood to mean a non-polarized, non-energizedarmature of this type. The respective electro.

bration penunit of power.

magnets I II and II of each unit and their armture means I2 and II areso disposed asto cause the respective armatures to be attracteclinopposite directions upon energization of the respective electromagnets.For this purpose, each armature I2 is shown as mounted above or at oneside of the corresponding vibratory member 2, and the electromagnet IIItherefor is mounted above or at the same side of said armature so as toattract the same upwardly or in a direction 10 toward said one side,while each armature I! is mounted below or at the other side of saidmember 2, and the corresponding electromagnet II is mounted below or atthe other side of said armature so as to attract the same downwardly 1or in a direction toward said other side.

In Fig. 3, there is shown a wiring-diagram for the electromagnetic unitat one sideof the device only, it being understood that the otherelectromagnetic unit may be similarly connected.

The coils or windings II of electromagnet III are connected byelectrical connections II and II to alternating current supply lines I9and 2i] which may be ordinary service lines of usual commercialfrequency. One of these connections, for 3; example connection I'I,includes a suitable rectifying means or electric check valve 2i, such asa copper oxide or thermionic tube rectifier, which operates to permitpassage of a current impulse or half wave in one direction but toprevent the a passage of a current impulse or half wave in the oppositedirection. The windings or coils it of electromagnet II are also shownas connected to the same servicelines I9 and 20 by electricalconnections 22 and 23 one of which includes a rectia: fying means 24which is adapted to permit passage of current impulses or half waveswhich are in opposite direction to the impulses transmitted through therectifying means 2i. The operation of these rectifying units 2| and 24is illustrated 41 diagrammatically in Fig. 4 wherein the curve b-b isthe graph of an alternating current, the positive half waves being shownabove the horizontal line a-a, representing zero current, and thenegative half waves belowthat line in the 4 usual manner, and thepositive half waves being transmitted through connections I! and I8 andrectifier 2| to the coil l5 whereas the negative half waves aretransmitted through connection 22 and 28 and rectifier 24 to the coilIi. 5

The rectifiers 2i and 24 may be of any suitable type. We have used theso-called copper-oxide rectifiers in practical operation with successfulresults.

The bumpers or stops 40 and 4| may be ad- Justed, if necessary, bysuitable means such as shown at 29. The main function of these bumpersor stops is to limit or stop the travel of the armatures in eitherdirection before they strike the magnet pole pieces in order to preventinjury to the laminations. These stops or bumpers also tend to impartaccelerating impulses to the armatures or vibrating members whenreleased by the diminution of current in the energizing coils I! or I8,as the case may be. The stops or bumpers 40 and H may be of rubber orany other suitable yielding or resilient material, and may if desired bedispensed with, but in that case the resilient supporting means 38 and39 must be made heavier, with the result that the construction is lessresilient and will give correspondingly less vi- The stopsmay benormally incontact with the vibratory members 2, or they may be slightlyspaced from the same, as may be desired.

The energizing circuit may be a. single phase or available frequency,for example 25 to 60 cycles per second, these being the frequenciesordinarily used in commercial lines. Suitable switch means It will beprovided controlling connection benetic means above described; alsosuitable adjustable resistances 32, or impedances, autotransformers orother devices may be included in the circuit connections for controllingor regulating the intensity of the current supply, to cor respondinglycontrol or regulate .the operation of the apparatus.

supplied to the electromagnetic devices from the supply lines I! and 20is controlled by the rectifiers 2| and 24 in such manner that thepositive impulses or half waves of currentwill be allowed to passthrough rectifier II to the winding IE but will be prevented byrectifier 26 from passing through rectifier ii to coil l6; whereas thenegative impulses or half waves alternating with the positive impulsesor half waves will be permitted to pass through rectifier 24 to coil Ibut will be prevented by rectifier II from passing to coil it. As thepositive or negative impulses or half waves successively alternate orsucceed one another in the operation of the alternating current, thewindings i5 and I6 alternately energize electromagnets II and ii whichoperate upon the armatures i2 and II to produce the rapid reciprocationor vibration of the members 2 and of the member 8 connected thereto.

Any suitable means may be used for applying energizing currentalternately to the two electromagnets of the operating units, "forexample, we can use instead of a copper-oxide rectifier any other formof electrical check valve such as a thermionic tube or electronicrectifier or a mechanical rectifier consisting of a rotating timerdriven by a synchronous motor operated from the alternating currentsupply circuit; or if suitable alternating current power is notavailable, direct current can be used by passing it through acombinat'lon timer and interrupter so as to produce pulsating currentand deliver the successive pulsations alternately. first to one set ofcoils and then to the opposite set of coils repeatedly.

for any reason.

In Figs. 5 to 'l we have shown several modifications of the energizingcircuit hook-up and referring particularly to Fig. 5, a half-speedsynchronous motor ii is shown operatively connected to a rotatablecommutating switch I provided alternating current supply circuit of anysuitable tween the energizing circuit and the electromag- In theoperation of the apparatus the current While we prefer to connect theapparatus di-.

mechanism at increased speed for short periods with suitable connectionto alternating current energy supply lines 53 and 54 and arranged todeliver successive half-waves alternately to the respectiveelectro-magnet windings l5 and l6.

The arrangement shown in Fig. 6 may be used 5 either with a source ofalternating current energy supply or a source of direct current energysupply, the energy supply lines being designated at and 66. In case thesupply lines 65 and 56 provide alternating current of the desiredfrequency, 10 the motor 61 operating the switch means 58 may be afull-speed synchronous motor and this arrangement will provide fordelivery of successive half-waves to the windings i6 and ii in the samemanner as described in connection with Fig. 5. If the supply lines 55and 66 provide a source of direct current energy, the motor 61 may be ofany suitable type, and will serve to periodically connect first one andthen the other of the windings l5 and ii to the source of energy.

, In Fig. 'l we have shown an arrangement in which a motor 69 isconnected to the supply lines 60 and ii of either an A. C. or D. C.supply circuit, and operates to drive an alternator 62 whose leads 68and N are connected to the windings I5 26 and I6 through the use of.associated copper oxide or thermionic tube rectifiers II and Nrespectively, in the same manner as shown in Figs.

3 and 4. This arrangement is useful where the respective windings are tobe energized at a fre- I0 quencydiiferent from the frequency existing inthe supply lines 60 and ii or to utilize a direct current supply todrive an alternating current supply means, in which case the leads 63and N become energy supply lines comparable to those I shown at I! andin Fig. 3.

This application is a division of our co-pending application. Serial No.29,366 for reissue of Patent'No. 1,945,015.

- We claim:

1. A vibratory apparatus comprising: a frame structure; an elongatedrigid vibratory member resiliently disposed on said frame structure andadapted for vibratory motion in a direction transverse to the lengththereof, said vibratory memher being resiliently engaged by resilientsupporting means. secured to said frame structure at opposite sides ofthe central portion of said vibratory member; two separate non-polarizedarmature means mounted on the central portion of said member; a. pair ofelectromagnets secured to said frame and operatively associated with therespective armature means and acting oppositely thereon in saiddirectionof vibration; and means for alternately supplying unidirectionalelectrical energy to the respective electromagnets.

2. The invention set forth in claim 1. and comprising in addition:resilient stops positioned on said frame for engagement with saidvibratory member at opposite sides of said member in the 00 direction ofvibration thereof at positions removed from said armature meanslongitudinally of said member.

HUGH E. WURZBACH.

CLYDE H. KONOLD. 05

